text: TMAO reductase has an enzyme commission (EC) number of 1.7.2.3. EC numbers are a system of enzyme nomenclature, and each part of this nomenclature refers to a progressive classification of the enzyme with regards to its reaction. The first number defines the reaction type, the second number provides information on involved compounds, the third number specifies the type of reaction, and the fourth number completes the unique serial number for each enzyme.
  Trimethylamine N-oxide reductase has the EC number 1.7.2.3, and these components refer to the following enzyme classifications:
  * EC 1 enzymes are oxidoreductase enzymes, where an oxidation reduction reaction occurs, and the substrate being oxidized is either an oxygen or hydrogen donor
  * EC 1.7 enzymes act on other nitrogenous compounds as donors
  * EC 1.7.2 enzymes have a cytochrome as an acceptor
  * EC 1.7.2.3 is the enzyme TMAO reductase, which reduces the cytochrome TorC